| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.hadoop.hdfs.server.namenode; |
| |
| import java.io.File; |
| import java.io.FileNotFoundException; |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.EnumSet; |
| import java.util.LinkedList; |
| import java.util.List; |
| import java.util.regex.Matcher; |
| import java.util.regex.Pattern; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| import org.apache.hadoop.fs.FileUtil; |
| import org.apache.hadoop.hdfs.server.common.Storage.StorageDirectory; |
| import org.apache.hadoop.hdfs.server.namenode.NNStorage.NameNodeDirType; |
| import org.apache.hadoop.hdfs.server.namenode.NNStorage.NameNodeFile; |
| |
| import com.google.common.collect.ImmutableList; |
| import com.google.common.collect.Lists; |
| |
| class FSImageTransactionalStorageInspector extends FSImageStorageInspector { |
| public static final Logger LOG = LoggerFactory.getLogger( |
| FSImageTransactionalStorageInspector.class); |
| |
| private boolean needToSave = false; |
| private boolean isUpgradeFinalized = true; |
| |
| final List<FSImageFile> foundImages = new ArrayList<FSImageFile>(); |
| private long maxSeenTxId = 0; |
| |
| private final List<Pattern> namePatterns = Lists.newArrayList(); |
| |
| FSImageTransactionalStorageInspector() { |
| this(EnumSet.of(NameNodeFile.IMAGE)); |
| } |
| |
| FSImageTransactionalStorageInspector(EnumSet<NameNodeFile> nnfs) { |
| for (NameNodeFile nnf : nnfs) { |
| Pattern pattern = Pattern.compile(nnf.getName() + "_(\\d+)"); |
| namePatterns.add(pattern); |
| } |
| } |
| |
| private Matcher matchPattern(String name) { |
| for (Pattern p : namePatterns) { |
| Matcher m = p.matcher(name); |
| if (m.matches()) { |
| return m; |
| } |
| } |
| return null; |
| } |
| |
| @Override |
| public void inspectDirectory(StorageDirectory sd) throws IOException { |
| // Was the directory just formatted? |
| if (!sd.getVersionFile().exists()) { |
| LOG.info("No version file in " + sd.getRoot()); |
| needToSave |= true; |
| return; |
| } |
| |
| // Check for a seen_txid file, which marks a minimum transaction ID that |
| // must be included in our load plan. |
| try { |
| maxSeenTxId = Math.max(maxSeenTxId, NNStorage.readTransactionIdFile(sd)); |
| } catch (IOException ioe) { |
| LOG.warn("Unable to determine the max transaction ID seen by " + sd, ioe); |
| return; |
| } |
| |
| File currentDir = sd.getCurrentDir(); |
| File filesInStorage[]; |
| try { |
| filesInStorage = FileUtil.listFiles(currentDir); |
| } catch (IOException ioe) { |
| LOG.warn("Unable to inspect storage directory " + currentDir, |
| ioe); |
| return; |
| } |
| |
| for (File f : filesInStorage) { |
| LOG.debug("Checking file " + f); |
| String name = f.getName(); |
| |
| // Check for fsimage_* |
| Matcher imageMatch = this.matchPattern(name); |
| if (imageMatch != null) { |
| if (sd.getStorageDirType().isOfType(NameNodeDirType.IMAGE)) { |
| try { |
| long txid = Long.parseLong(imageMatch.group(1)); |
| foundImages.add(new FSImageFile(sd, f, txid)); |
| } catch (NumberFormatException nfe) { |
| LOG.error("Image file " + f + " has improperly formatted " + |
| "transaction ID"); |
| // skip |
| } |
| } else { |
| LOG.warn("Found image file at " + f + " but storage directory is " + |
| "not configured to contain images."); |
| } |
| } |
| } |
| |
| // set finalized flag |
| isUpgradeFinalized = isUpgradeFinalized && !sd.getPreviousDir().exists(); |
| } |
| |
| @Override |
| public boolean isUpgradeFinalized() { |
| return isUpgradeFinalized; |
| } |
| |
| /** |
| * @return the image files that have the most recent associated |
| * transaction IDs. If there are multiple storage directories which |
| * contain equal images, we'll return them all. |
| * |
| * @throws FileNotFoundException if not images are found. |
| */ |
| @Override |
| List<FSImageFile> getLatestImages() throws IOException { |
| LinkedList<FSImageFile> ret = new LinkedList<FSImageFile>(); |
| for (FSImageFile img : foundImages) { |
| if (ret.isEmpty()) { |
| ret.add(img); |
| } else { |
| FSImageFile cur = ret.getFirst(); |
| if (cur.txId == img.txId) { |
| ret.add(img); |
| } else if (cur.txId < img.txId) { |
| ret.clear(); |
| ret.add(img); |
| } |
| } |
| } |
| if (ret.isEmpty()) { |
| throw new FileNotFoundException("No valid image files found"); |
| } |
| return ret; |
| } |
| |
| public List<FSImageFile> getFoundImages() { |
| return ImmutableList.copyOf(foundImages); |
| } |
| |
| @Override |
| public boolean needToSave() { |
| return needToSave; |
| } |
| |
| @Override |
| long getMaxSeenTxId() { |
| return maxSeenTxId; |
| } |
| } |